Help with "iterating" through queue

[hopesfall]

How could I "iterate" through a queue without altering its contents? I want to basically copy one queue onto another but I don't want to use .pop() because it'll remove the items from the original stack.

[Cubbi]

There are no iterators in std::queue, but it can be just copied:

#include <queue>
int main()
{
        std::queue<int> q1;
        q1.push(1);
        q1.push(2);
        q1.push(3);

        std::queue<int> q2 = q1;
        q2 = q1;
}

[Peter87]

If you want to iterate over the queue you can use std::deque instead. Just use push_back instead of push and pop_front instead of pop. You can iterate over a std::deque the same way you iterate over a std::vector.

[coder777]

If you feel like iterating through a queue it's likely the wrong container you're using.